Not really. The only real reason is to keep some "ground truth" that everyone can get back if to needed (and then to move forward using the official updates from there). Anyway, I guess that this is what you asked for: http://ixtab.tk/kindle-touch-updates/ . It's the only exhaustive list that I know of so far, so feel free to mirror it (and more importantly, make the mirrors known to all interested communities - including this one...)

Thanks. Just in case, here is hashes of the same files, which I've downloaded [earlier] from Amazon server.